Abstract
Mass transport kinetics on surfaces of single crystalline alumim (1102), 1530°-1770°C and spinel MgO⋅2.4Al2O3, (100), 1730°-1770°C were measured by the multiple scratch smoothing method. The amplitude of the periodical surface corrugation decayed exponentially with time during annealing. For alumina, dependence of the decay rate on the periodicity of corrugation indicated that surface diffusion is the dominant mass transport mechanism. The surface diffusion coefficient were in a good agreement with the available data obtained on surfaces with different orientations. In the case of spinel, determination of the mechanism was prevented by the strong effect due to a surface anisotropy observed. But the results were compared with the available diffusion coefficients and it was suggested either volume diffusion or surface diffusion of oxygen ion was the dominant mechanism. The mass transport was faster on alumina than on spinel by about an order of magnitude.
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